Tape drives showing no_hw

[mjos]

Hi,

I have an EML E series Library not sensing 4 tape drives out of the 12 drives. From the server end, the tape drives are showing as no_hw. This server is zoned to see the tape drives in the Library. The Library has three interface cards which is zoned & is attached to the cell server. From the cell server all the tape drives are showing as claimed.
The multipath option is selected in Data Protector & these backups run on SAN.
Please find below the ioscan output showing the 4 tape drives as no_hw

# ioscan -funC tape
Class I H/W Path Driver S/W State H/W Type Description
==================================================================
tape 10 1/0/4/1/0.12.161.255.0.0.0 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/10m /dev/rmt/10mn /dev/rmt/c75t0d0BEST /dev/rmt/c75t0d0BESTn
/dev/rmt/10mb /dev/rmt/10mnb /dev/rmt/c75t0d0BESTb /dev/rmt/c75t0d0BESTnb
tape 11 1/0/4/1/0.12.161.255.0.0.1 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/11m /dev/rmt/11mn /dev/rmt/c75t0d1BEST /dev/rmt/c75t0d1BESTn
/dev/rmt/11mb /dev/rmt/11mnb /dev/rmt/c75t0d1BESTb /dev/rmt/c75t0d1BESTnb
tape 18 1/0/4/1/0.12.162.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/18m /dev/rmt/18mn /dev/rmt/c77t0d0BEST /dev/rmt/c77t0d0BESTn
/dev/rmt/18mb /dev/rmt/18mnb /dev/rmt/c77t0d0BESTb /dev/rmt/c77t0d0BESTnb
tape 19 1/0/4/1/0.12.162.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/19m /dev/rmt/19mn /dev/rmt/c77t0d1BEST /dev/rmt/c77t0d1BESTn
/dev/rmt/19mb /dev/rmt/19mnb /dev/rmt/c77t0d1BESTb /dev/rmt/c77t0d1BESTnb
tape 0 1/0/4/1/0.12.167.255.0.0.0 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/0m /dev/rmt/0mn /dev/rmt/c72t0d0BEST /dev/rmt/c72t0d0BESTn
/dev/rmt/0mb /dev/rmt/0mnb /dev/rmt/c72t0d0BESTb /dev/rmt/c72t0d0BESTnb
tape 1 1/0/4/1/0.12.167.255.0.0.1 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/1m /dev/rmt/1mn /dev/rmt/c72t0d1BEST /dev/rmt/c72t0d1BESTn
/dev/rmt/1mb /dev/rmt/1mnb /dev/rmt/c72t0d1BESTb /dev/rmt/c72t0d1BESTnb
tape 8 1/0/4/1/1.22.161.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/8m /dev/rmt/8mn /dev/rmt/c74t0d0BEST /dev/rmt/c74t0d0BESTn
/dev/rmt/8mb /dev/rmt/8mnb /dev/rmt/c74t0d0BESTb /dev/rmt/c74t0d0BESTnb
tape 9 1/0/4/1/1.22.161.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/9m /dev/rmt/9mn /dev/rmt/c74t0d1BEST /dev/rmt/c74t0d1BESTn
/dev/rmt/9mb /dev/rmt/9mnb /dev/rmt/c74t0d1BESTb /dev/rmt/c74t0d1BESTnb
tape 16 1/0/4/1/1.22.162.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/16m /dev/rmt/16mn /dev/rmt/c76t0d0BEST /dev/rmt/c76t0d0BESTn
/dev/rmt/16mb /dev/rmt/16mnb /dev/rmt/c76t0d0BESTb /dev/rmt/c76t0d0BESTnb
tape 17 1/0/4/1/1.22.162.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/17m /dev/rmt/17mn /dev/rmt/c76t0d1BEST /dev/rmt/c76t0d1BESTn
/dev/rmt/17mb /dev/rmt/17mnb /dev/rmt/c76t0d1BESTb /dev/rmt/c76t0d1BESTnb
tape 2 1/0/4/1/1.22.167.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/2m /dev/rmt/2mn /dev/rmt/c73t0d0BEST /dev/rmt/c73t0d0BESTn
/dev/rmt/2mb /dev/rmt/2mnb /dev/rmt/c73t0d0BESTb /dev/rmt/c73t0d0BESTnb
tape 3 1/0/4/1/1.22.167.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/3m /dev/rmt/3mn /dev/rmt/c73t0d1BEST /dev/rmt/c73t0d1BESTn
/dev/rmt/3mb /dev/rmt/3mnb /dev/rmt/c73t0d1BESTb /dev/rmt/c73t0d1BESTnb

[mjos]

can somebody please help me what I should do so that these tape drives show up as claimed.

[Vincent Farrugia]

Hello mjos,

I assume that you were working fine and suddenly you are not seeing 4 drives.

Any of these could be the culprit:

1) Rezoning of the configuration not including the link to the 4 drives.
2) FC cable connecting the drives faulty.
3) SFPs connecting the drives faulty.
4) 4 tape drives faulty (highly unlikely).

I would start by replacing the FC cable, then by replacing the SFP.

HTH,
Vince

[mjos]

Is there any remapping that needs to be done from the server side once the interfaces are repalced on the library.
This issue came up only after the interfaces were changed on the library. Only some drives show up as no_hw.

[Torsten.]

NO_HW means the device was visible and currently it is not.

I would start with commandview tl and check the library for issues, if nothing found, check the switch.

[mjos]

Well everything looks fine on the CVTL. All the drives are online & also from the DP Cell server.
The issue is only on some of the servers which are zoned to see the tape drives.

[Torsten.]

Did you by chance changed the zoning on switches (or presentation in CV TL) to "hide" the drives from these servers?

[mjos]

No.
I recollect reading somewhere in the forum that fc cleanup needs to be done when the server is not able to detect the drives. Is there any such command?